Extending the surface/bulk phase link from flexible synthetic polymer/surfactant systems to stiff biomacromolecule/surfactant systems
Polyelectrolyte/surfactant mixtures adopt a variety of structures at static air/liquid interfaces. Systems have been previously classified into type 1 involving strong complex adsorption and thick layers and type 2 forming thin layers and a surface tension peak. Recently we have shown on FIGARO that a surface tension peak characteristic for type 2 systems occurs after unlimited precipitation of surface-active materials both in systems characterized as type 1 and type 2. These results highlight the needs to collect data under well-defined bulk conditions for a range of strongly interacting systems and to examine the link between the interfacial properties and non-equilibrium effects in the bulk both for synthetic polymers and biomacromolecules such as rigid DNA or protein molecules. To re-evaluate the interactions governing the interfacial properties of the DNA/CTAB system, we propose to measure the surface excess and interfacial composition in the phase separation region with respect to two well-defined bulk states. This work will also contribute to the basis of a new generalized model to describe P/S systems at interfaces with respect to their bulk phase behavior.
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VARGA Imre; Richard A. Campbell and KARDOS Attila. (2013). Extending the surface/bulk phase link from flexible synthetic polymer/surfactant systems to stiff biomacromolecule/surfactant systems. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-10-1282
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